Furnace construction



W. G. WISE.

FURNACE CONSTRUCTION. APPLICATION FILED 050.5, 1921.-

Patented July 11, 1922.

IN VEN TOR.

v Wilbev't B.Wise

ATTORNEY. I

STATES FATENT @FHQE.

FURNACE CONSTRUCTION.

Specification of Letters Patent.

Patented July 11, 1922.

Application filed December '5, 1921. Serial No. 519,807.

To all whom it may concern:

Be it known that I, WILBERT Gr. When, a citizen of the United States, residing at Akron, in the county of Summit, State of Ohio, have invented certain new and useful Improvements in Furnace Constructions,

of which the following is a specification.

This invention relates to a furnace con struction, particularly to that type of furnace known as thetwo casing or pipeless variety in which there are provided an inner and outer casing, the inner casing for the passage of the heated air upwardly from around the furnace and the outer casing for the conduction of the cold air downward into the casing. This type of furnace detailed narration of the invention is for the purpose ofenabling the same to be understood and is not to be taken as limiting the invention to exactness in detail.

In the drawing:

Fig. 1 is a side elevation of a pip'eless ordouble casing furnace with my invention incorporated therewith.

Fig. 2 is an enlarged cross-sectionthrough the top of the furnace with the register in position and partially broken away.

Fig. 3 is a planview of the register.

Fig. 4 is a view looking at the underside of a fragment of the register.

.In prior constructions of double casing furnaces, ithas been customary to make a single rectangular register which covers both the inner and the outer casing, the lower side of the register being provided with a ring which is designed to fit the inner circular pipe tightly. As the inner and outer casings are made of thin sheet metal, it has proven a very tedious and time-consuming operation to place the register on the two pipes and obtain a seating of the flange or ring on the inside pipe, this being usually the last operation in installing the furnace and all the work being done from above. To improve upon this condition there has been constructed a form of register in which the central portion or hot air section of the register is made removable from the remainder of the register; but this does not assist in assembling the register and the furnace to any great extent, as the casing must fit over the outside of the flange on the register and the erectors have to work from the inside of the opening. Furthermore, a considerable. portion of the grill work is filled up with the metal required to support the inner register and the efficiency of the register is materially reduced. By the present invention the objectionable features in both prior types are eliminated and the register is quickly and easily put in place. The connection between the inner and outer pipes is firm, and rattle and vibration of the casings is done away with.

In the drawing only such portion of the furnace is shown as will enable my invention to be understood, the furnace being of any well known type.

The furnace comprises an outer casing 1, the body portion of which is round, the upper extension being usuallyv square or rectangular so that the register can be located in the floor without difficulty. The inner casing is represented-by the numeral 2 and is spaced therefrom to provide the cold air passageway 2. As has been stated the outer casing is usually square, while the inner casing is usually circular in cross section, although these shapes arenot necessary and do not form a part of the invention, as other shapes will be adaptable to the purposes. Both casings are made of the usual galvanized sheet metal.

The floor is indicated by the numeral 4 and the register by the numeral 5. The register is made in the usual grill to provide as little obstruction to the passage of air as possible. Instead of bringing the inner casing 2 up to the level of the outer casing, it may be terminated below the plane of the outer casing. The upper edge of the inner casing is stiffened or maintained in its proper'shape by any suitable means, that shown herein comprising the placing on the edge of a stiff metallic reinforce or endless ring 6. This ring is preferably a true circle and is provided with a flange 7, which rests on. the top of the inner casing. The ring 6 serves to bring the inner casing to true circular form, and provides a rigid form into which the register seats. This is an improvement over prior forms in Which the inner casing was not reinforced or stiffened but constructed Wholly of the usual light galvanized sheet metal and in Which the casing Would not. retain its circular form.

The register fits within the outer casing and on the under side of the register is located a plurality of lugs 8, which are preferably four in number and are either formed integrally with the register or attached thereto. The outer surfaces of the lugs are tapered slightly so as to facilitate their entrance into the ring 7 at the upper end of the casing and to insure a tight fit between the register and the casing.

In assembling the furnace, the workman first places the stiff metal ring in the top of the inner casing. This brings the inner casing to its true shape and provides a seat for the lugsof the register. The register is now put in place and the lugs enter Within the ring, the tapered surfaces on the lugs straightening up the inner casing and insuring a tight fit.

As has been stated, the shape of the inner and outer casings is immaterial, and the number and position of the lugs may be changed. The lugs may fit Within or outside of the stiff bead or ring on the'inner casing.

The means to shape and stiffen the upper endof the inner casing may be varied, one

of the principal features ofthe invention be ing the stiffening of the inner casing so that it will receive the register.

Other modifications and variations may be made Within the scope of the invention and Within the interpretation of the claims append-ed hereto.

What I claim is 1. In a furnace construction having an inner and an outer casing, a stiffening member at the upperend of the inner casing, a register over the casings and formations on the register adapted to engage the member to hold the inner casing.

2. In a furnace construction having an inner and an outer casing, a stiffening member at the upper end of the inner casing, a register over the casings and a )rojecting formation on the register adapted to maintain the upper end of the inner casing in fixed position. 7

3. I11 a furnace construction having an inner and an outer casing, a stiff metal ring seated Within the inner casing, a one piece register oversaid casings and tapered lugs depending from the underside of the register the casings and a formation depending from the underside of the register and adapted to engage the stiffened upper end of the inner casing.

5. In a furnace construction having an inner and an outer casing, the upper portion of the inner casing being stiffened at its upper end to hold a true circular form, a onepiece register over both said casings and a plurality of tapering lugs dependingfrom the underside of the register and adapted to hold the stiffened upper end of the inner casing.

6. In a furnace construction having an inner and an outer casing, means located on the upper edge of the inner casing to stiffen it, a one piece register independent of the said stiffening means over the inner and outer casings, and interengaging devices adapted to center the inner casing and the register. I r

7 In a furnace construction of the pipeless variety, an inner casing, a register,

means separate from the register on the up per edge of the innercasing to stiffen and to form an interengaging means between the stiffened upper edge of the inner casing and the register to hold the said parts in position. I

WILBERT e. vvisn.

register and a tapering formation adapted 

